Re: the build
Here's what I'm not sure about: the venturi vacuum signal is related to how much air is flowing through the carburetor. If air flow is split between two carburetors, wouldn't the venturi vacuum signal be less than normal, perhaps by one half? This would result in in less of the RPM-related distributor advance (controlled by the venturi vacuum signal) and hinder performance. The manifold vacuum shouldn't be changed too much, but that would be near zero under heavy loads.
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